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Unified Diff: media/audio/audio_system.h

Issue 2675713002: Switch Speech Recognition to asynchronous callback-based AudioManager interactions. (Closed)
Patch Set: Created 3 years, 11 months ago
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Index: media/audio/audio_system.h
diff --git a/media/audio/audio_system.h b/media/audio/audio_system.h
new file mode 100644
index 0000000000000000000000000000000000000000..eddaa5c6b33ba98407e46c6af2a49132873f4323
--- /dev/null
+++ b/media/audio/audio_system.h
@@ -0,0 +1,36 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_AUDIO_AUDIO_SYSTEM_H_
+#define MEDIA_AUDIO_AUDIO_SYSTEM_H_
+
+#include "base/callback.h"
+#include "media/audio/audio_device_description.h"
+#include "media/base/audio_parameters.h"
+#include "media/base/media_export.h"
+
+namespace media {
+class AudioManager;
+
+// Work in progress: Provides asynchronous interface to AudioManager. All the
+// AudioManager clients will be switched to it, in preparation for moving
+// to Mojo audio service.
+class MEDIA_EXPORT AudioSystem {
tommi (sloooow) - chröme 2017/02/02 16:27:18 I feel that adding a new class at the same level a
o1ka 2017/02/02 16:32:22 This is a staged switch to Mojo audio service (see
+ public:
+ // Replies are asynchronously sent to the thread the call is issued on.
+ using OnAudioParamsCallback = base::Callback<void(const AudioParameters&)>;
+
+ virtual base::SingleThreadTaskRunner* GetTaskRunner() const = 0;
+
+ // Callback will receive invalid parameters if the device is not found.
+ virtual void GetInputStreamParameters(const std::string& device_id,
+ OnAudioParamsCallback on_params_cb) = 0;
+
+ // Must not be used for anything but stream creation.
+ virtual AudioManager* GetAudioManager() = 0;
+};
+
+} // namespace media
+
+#endif // MEDIA_AUDIO_AUDIO_SYSTEM_H_

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